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Import Utilities

I have used the exp utilities to backup my oracle Database but still having problem with using imp.
I tried to import the exported file that oracle database is in but keep on geting this error
"failed to open dba.dmp"
I exported using: exp username/paswd file=dba.dmp full=Y
and was successfull
So, I moved on to import the file using:
imp username/passwd file=dba.dmp fromuser=username
But keeps on giving error..cannot open the file..
Can any one help me.

I think Jeff's point seems to have been lost in this discussion. The exp and imp utilities should not be considered as a backup strategy in their own right. They can be a useful addition to a backup strategy, but on their own they are a recipe for disaster.

You really should consider switching to another form of backups, preferably RMAN. This might help you get to grips with RMAN: